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Cirrus Logic CS6422 Full-Duplex Speakerphone IC

Cirrus Logic's CS6422 Full-Duplex Speakerphone IC is an enhanced speakerphone IC that enables full-duplex conversation using echo cancellation and suppression in a single-chip solution. The CS6422 can easily replace existing half-duplex speakerphone ICs with a huge increase in conversation quality. The CS6422 consists of telephone & audio interfaces, two codecs and an echo-cancelling DSP. Most modern speakerphones use half-duplex operation, which alternates transmission between the far-end talker and the speakerphone user. This is done to ensure stability because the acoustic coupling between the speaker and microphone is much higher in speakerphones than in handsets where the coupling is mechanically suppressed.
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Cirrus Logic CS6422-CSZ
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Cirrus Logic Audio Amplifiers Enhanced Full-Duplex Speakerphone IC
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Cirrus Logic Audio IC Development Tools Eval Bd Enhanced Full-Duplx Spkrphone
Page 381

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